Full Gauge Controls TC-940R Owner's manual

Brand: Full Gauge Controls

Model: TC-940R

Type: Owner's manual

This manual is also suitable for

TC-940R i Plus

Full Gauge Controls TC-940R i Plus is a temperature controller specifically designed for refrigeration and defrost cycles. It features advanced capabilities that optimize system efficiency and enhance user control.

Key features of the TC-940R i Plus include:

Precise temperature control: Set and maintain desired temperatures with high accuracy, ensuring optimal product preservation.
Defrost management: The controller automatically initiates and manages defrost cycles based on temperature or time, preventing frost buildup and maintaining evaporator efficiency.
Digital input: Utilize the digital input for external synchronization of defrost cycles or to activate nighttime setpoint mode, providing flexibility in operation.

Key features of the TC-940R i Plus include:

Precise temperature control: Set and maintain desired temperatures with high accuracy, ensuring optimal product preservation.
Defrost management: The controller automatically initiates and manages defrost cycles based on temperature or time, preventing frost buildup and maintaining evaporator efficiency.
Digital input: Utilize the digital input for external synchronization of defrost cycles or to activate nighttime setpoint mode, providing flexibility in operation.

Ver.01

DIGITAL CONTROLLER FOR

REFRIGERATION AND DEFROST

WITH ALARM OUTPUT

TC-940Ri plus

1. DESCRIPTION

The TC-940Ri plus is a temperature controller that manage cycles of defrost, start and finish, when

only necessary, based in evaporator temperature, and they have one output for alarm or shutdown

lamps. They have function to wait residual refrigerant fluid returns in defrost. Thus, it is possible to save

energy and increase the efficiency of the system.

The TC-940Ri plus have one digital input for extern synchronize defrost. This same input can

change setpoint to nigthtime mode. This digital input can generate a visual and audible alarm too, to

indicate open door, for exemple.

The TC-940Ri plus have a digital filter that simulates an increase response time of sensor S1 to

avoid the compressor action in fast changes of temperature.

They have one serial port to comunicate whith Sitrad .

Product complies with UL Inc. (United States and Canada).

2. APPLICATION

• Counters

• Refrigerated balcony

3. TECHNICAL SPECIFICATIONS

- Power supply: 12Vdc

- Control temperature: -50 to 75° C / -58 to 167°F

- Resolution: 0.1°C from -10 to 75°C and 1°C outside this range / 1°F in all range

- Operating temperature: 0 to 50°C / 32 to 122°F

- Operating humidity: 10 to 90% RH (without condensation)

- Dimensions: 71 x 28 x 71mm

- Load current (outputs):

COMP: (compressor, solenoid valve or contactor)

FANS: 5(3)A / 240Vac 1/8HP (evaporator fans)

DEFR: 5(3)A / 240Vac (defrost - resistance or hot gas)

ALRM: 3A / 240Vac resistive load (external alarm)

12(8)A/240Vac 1HP

4. CONFIGURATIONS

4.1 - Setting the control temperature (SETPOINT)

Press for two seconds, until the message appears, and then release. The current working

temperature will be displayed. Use the keys and to change the value and then press to

save.

If the operating mode of the digital input is configured for nighttime setpoint (F31=3), the message

will be displayed after the message to allow setting the daytime setpoint. Use the keys or

to change the value and then press to save. Then will be displayed to allow setting the

nighttime setpoint, use the same procedure above to adjust it and leave the setup mode.

SET

4.3 - Parameters description

F01 - Access code (123)

It is necessary to change the configuration parameters. To visualize the adjusted parameters, it is not

necessary to insert this access code.

F02 - Control differential (hysteresis)

It is the difference of temperature (hysteresis) between ON and OFF the refrigeration.

Example: You need to control temperature in 4.0 ºC with differential of 1.0 ºC.

So, the refrigeration is turned off in 4.0 ºC and will be turned on in 5.0 ºC (4.0 +1.0).

F03 - ambient

It allows to compensate eventual shuting lines on reading of ambient temperature (S1), proceeding of

sensor exchange or cable length alteration.

It allows to compensate eventual shuting lines on reading of ambient temperature (S2), proceeding of

sensor exchange or cable length alteration.

F05 - Minimum setpoint allowed to the end user

F06 - Maximum setpoint allowed to the end user

It is to prevent that incorrect high or low temperatures be regulated.

F07 - Defrost type

“0” = Electrical defrost (resistances),where is kept on only the defrost output.

“1” = Hot gas defrost, where defrost and compressor outputs are kept on.

F08 - Initial defrost condition

It defines if the defrost start will be for temperature or time. Is this function has the value “1”, when the

evaporator temperature reaches the configured value in “F11” the instrument starts to count the pre-

defrost time and, after, will do the defrost.

F09 - Period between defrosts (if F08 = 0)

It determines the time between two consecutives defrost cycles, and starts to be counted from the last

defrost. Attention, the defrost only will start if the temperture in S2 (evaporator sensor) is lower than F14.

F10 - Maximum time in refrigeration (for security, if F08 = 1)

It acts as security time (if F08 = 1) and evaporator temperature will not reach the configured value in

“F11”. This function determines the maximum time that controller will stay without defrost.

F11 - Temperature in the evaporator for defrost start (if F08 = 1)

When evaporator temperature reaches the configured value in this function the controller will start to

count the pre-defrost period (F12).

F12 - Time of pre-defrost (if F08=1)

At the moment that the temperature in evaporator decreases and reaches the configured value in “F11”,

start to be counted the pre-defrost time. During the pre-defrost stage, if the temperature is kept low the

defrost starts, else if the temperature increase at least 1 ºC in relation to configured value, the system

returns to refrigeration stage.

F13 - Defrost when the instrument is powered on

It possibilities the defrost at the moment that the controller is turned on, for example, in return of electrical

energy (in case of energy lacks).

F14 - Evaporator temperature (S2) for end defrost

If evaporator temperature (sensor S2) reaches the adjusted value, the end defrost will happen for

temperature. With this , the defrost process is optimized.

F15 - Maximum defrost duration

This function serves to adjust the maximum value of time to defrost. If in this period the evaporator

temperature will not reach the configured value in F14 a point will be blinking on inferior down right side of

display indicating that the end defrost ocurred for time and not for temperature.

This can happen when the adjusted temperature is very high, the limit time will be not enough, the S2

sensor is detached or not in contact with the evaporator.

F16 - Fan turned on during defrost

It possibilities the fan functioning during defrost.

F17 - Delay to do first defrost (if F08=0)

This function defines an extra time that the instrument will keep in refrigeration before do the first defrost,

to prevent that lot of counters enter in defrost at the same time. This time only appears before the first

defrost, when F08 = 0 (initial defrost for time).

F18 - Locked temperature indication (S1) during defrost

This function prevents that ambient temperature elevation be visualized. During defrost the last

measured temperature in refrigeration cycle will be locked on display. The indication will be released

when this temperature will be reached again or 15 minutes after the begin of next refrigeration cycle.

F19 - Draining time (dripping of defrost water)

Necessary time for dripping, it means, to drain the last water drops of the evaporator. All the outputs

keep turned off. If you do not need this stage, adjust this time for ”zero”.

F20 - Evaporator temperature (S2) for fan return after draining(fan-delay)

After the draining, the fan-delay cycle starts. The refrigeration (COMP) output is turned on, because the

evaporator temperature is high, but the fan only is turned on after evaporator temperature decreases the

adjusted value. This process is necessary to remove the heat that exists in the evaporator because the

defrost, preventing to pass it to the ambient.

Indication offset of the temperature

F04 - Indication offset of the evaporator temperature

Example: Natural defrost or by resistances installed outside the evaporator.

Access code: 123 (one hundred and twenty-three)

Control differential (hysteresis)

Offset indication for ambient sensor

Indication offset of the evaporator temperature (offset)

Minimum setpoint allowed to the end user

Maximum setpoint allowed to the end user

Defrost type (0 = resistance; 1 = hot gas)

Initial defrost condition (0 = time; 1 = temperature)

Period between defrost (if F08 = 0)

Maximum time in refrigeration (for security, if F08 = 1)

Temperature in the evaporator for defrost start (if F08 = 1)

Time of pre-defrost (if F08 = 1)

Defrost when the instrument is powered on (0 - no; 1 - yes)

Evaporator temperature (S2) for end defrost

Maximum defrost duration (for security)

Fan turned on during defrost (0 - no; 1 - yes)

Delay to do the first defrost (if F07 = 0)

4.2 - Parameters table

CELSIUS

Fun

FAHRENHEIT

247

Compressor status with detached ambient sensor

(0 = off; 1 = on)

Intensity of the digital filter applied to ambient sensor (S1)

Network equipment address RS - 485

Locked temperature indication (S1) during defrost (0 - no; 1 - yes)

Draining time (dripping of defrost water)

Evaporator temperature (S2) for fan return after draining

Maximum time for fan return after draining (fan-delay)

Fan on with compressor off (0 - no; 1 - yes)

Fan stop for high temperature in evaporator

Hysteresis for fan return (after stoping for high temperature

in evaporator)

Low temperature alarm (S1)

Alarm hysteresis of low temperature

High temperature alarm (S1)

Alarm hysteresis of high temperature

Inhibition time of alarm when the instrument is powered on

Inhibition time of alarm after draining

Digital input operating mode

Time for inhibiting the open door alarm

Time for collecting the defrost gas

Delay when the instrumet is powered on

Minimum time of compressor turned on

Minimum time of compressor turned off

Description Min Max Unit

Standard

Min Max Unit

Standard

-99

0.1

-20

-50

999

20.0

75.0

999

240

75.0

999

°C

min.

hours

°C

min.

°C

min.

1.5

0.0

-50

75.0

240

-5.0

40.0

-99

-36

-58

999

167

999

240

167

999

°F

min.

hours

°F

min.

°F

min.

-58

167

240

104

-50

0.1

-50

0.1

-50

0.1

75.0

20.0

75.0

20.0

75.0

20.0

999

min.

°C

min.

°C

ºC

°C

min.

sec.

0.0

75.0

2.0

-50

1.0

75.0

1.0

-58

167

999

min.

°F

min.

°F

ºF

°F

min.

sec.

167

-58

167

E251415

TC940PLV01-03T-11744

F21 - Maximum time for fan return after draining (fan-delay)

For security, if the evaporator temperature does not reach the adjusted value in F20 or the S2 sensor is

detached, the fan-delay will happen after passed the adjusted time in this function.

F22 - Fan on with compressor off

During refrigeration, the fan can be depend of the compressor status.

”0” = The fan keeps turned on while compressor is turned on (this alternative, in some cases,

Possibilities a great economy of electrical energy).

”1” = The fan keeps turned on during all refrigeration cycle.

F23 - Fan stop for high temperature in evaporator

This function cycles the evaporator fan until that ambient temperature approaches of the temperature

desired in the refrigerating installation project. This preventing high temperature and suction pressures

that can damage the compressor. If the temperature in evaporator pass the adjusted value, the fan is

turned off, turning on again with a configurable hysteresis in F24.

F24 - Hysteresis for fan-delay (after stopping for high temperature in evaporator)

It allows to determine the difference of temperature to fan-delay had to a stop for temperature above

desired in evaporator.

F25 - Low temperature alarm (S1)

If the ambient temperature (sensor S1) decreases above this point during refrigeration, this will be

signalized through the message on display and the output (NO/NC) of alarm will be turned on.

F26 - Alarm hysteresis of low ambient temperature

It is the difference of temperature to turn off the alarm output for low ambient temperature.

F27 - High temperature alarm (S1)

If the ambient temperature (sensor) reaches this point during the refrigeration, this will be signalized

through the message on display and the output (NO/NC) of alarm will be turn on.

F28 - Alarm hysteresis of high temperature

It is the temperature to turn off the alarm output for high ambient temperature.

F29 - Inhibition time of alarm when the instrument is powered on

During this time the alarm is kept turned off waiting that the system starts to working.

F30 - Inhibition time of alarm after draining

This function serves to inhibit the alarm during a period after draining, because it is normal an elevation of

the temperature proceeding of the defrost.

F31 - Digital input operating mode

The digital input can be configured to operate as follows:

0=none;

1=defrost synchronization;

2=open door alarm,

3=nighttime setpoint.

F32 - Time for inhibiting the open door alarm

During this time the door open alarm is kept off.

F33 - Time for collecting the defrost gas

After starting the defrost the controller will keep only the fan on for this time to use the remaining energy of

the gas.

F34 - Delay when the instrument is powered on

When the instrument is turned on, it can keep a time with its control disabled, delaying the process initial.

During this time it functions only as temperature indicator. It serves to prevent demand peaks of electrical

energy, in case of lack or return of the same, when a lot of equipments are connected in the same line. For

this, adjust different times for each equipment. This delay can be of compressor or defrost (when exists

defrost on start).

F35 - Minimum time of compressor turned on

It is the time that the compressor will keep turned on, it means, the time period between the last started and

the next stopped.

F36 - Minimum time of compressor turned off

It is the minimum time that the compressor will keep turned off, it means, the time period between the last

stopped and the next started. It serves to alliviate the pressure and to increase the useful life of the

compressor.

F37 - Compressor status with detached ambient sensor (S1)

If the ambient sensor (S1) is detached or out specified range, the compressor assumes the configured

status in this function.

Exemple: For counters that storage fruits it is better that the compressor keeps turned off, but in counters

that storage meats it is better that the compressor keeps turned on.

ambient (S )

F39 - Network equipment address RS - 485

Equipment's network address for communicating with Sitrad software.

Note: One network must not have different equipment with the same address.

F38 - Intensity of the digital filter applied to the sensor 1

This filter aims at simulating an increase of environment sensor (S1) mass, thus increasing its response

time (thermal inertia). The larger the value adjusted in this function, the longest the response time of

sensor S1.

A typical application requiring this filter is the freezer for ice cream or frozen goods, because when the door

is opened a hot air mass reaches the sensor directly, causing a quick rise in the indication of the measured

temperature, causing the compressor to be activated unnecessarily many times.

5.4 - Initial defrost condition

The function “F08” determines if the start of the defrost will be for time or temperature.

F08 = 0 The start of defrost will happen after elapsed the configured time in F09.

F08 = 1 When the temperature in the evaporator reaches the configured value in F11, the

count of pre-defrost period will start (F12). After elapsed this time, if the temperature keeps low the

defrost will start. If the temperature increases, the controller returns to refrigeration stage.

5.5 - How to determine the end defrost for temperature

a) Adjust the follow functions with maximum values:

- Interval between defrosts (F09 = 999 min)

- Evaporator temperature for end defrost (F14 = 75 ºC)

- Defrost maximum duration (F15 = 90 min)

b) Wait until an ice layer to be created on the evaporator.

c) Do a manual defrost, pressing for 4 seconds, until appear .

d) Observe the melting process.

e) Wait until melt all defrost on evaporator to consider the defrost finalized.

F) Check the temperature in evaporator read by the sensor S2 at this moment, pressing and copy

this value to the function F14 - Evaporator temperature (S2) for end defrost.

g) As security, adjust again the function F15 - Maximum duration of defrost, that depends of the defrost

type. Exemple: Electrical defrost (resistance) = 45 minutes as maximum

Defrost for hot gas = 20 minutes as maximum

h) Now adjust the function F09 -Interval between defrosts as desired value.

5.6 - Manual defrost

To do a manual defrost, regardless of the programming, keep pressed for 4 seconds, until appears

the indication .

If the instrument is in defrost and you want to finish it, follow the above instructions, until appears the

indication .

5.7 - Indicators and Alarms

The leds indicate the control outputs status:

COMP: Compressor or solenoid of liquid gas

FANS: Evaporator fans

DEFR: Defrost (resistances or hot gas)

ALRM: Alarm output

Detached ambient sensor or temperature (S1) out the range

Detached evaporator sensor or temperature (S2) out the range

Low ambient temperature alarm

High ambient temperature alarm

Always that the defrost is finished by time and not for temperature a point located on right inferior

side of display will be blinking until the next defrost, indicating that:

- The interval between defrost is too long.

- There are burned resistances

- The hot gas is not circulating

- There is an inoperative fan

- The adjusted time for maximum duration of defrost is short.

Invalid configuration parameters.

- In this situation the outputs will be turned off.

- Check which parameter have invalid information and correct it to return to normal operation.

4.3.1 - Unit selection (ºC/ºF)

To determine the unit that the instrument will work, access the function “F01” with the access cod 231 and

confirm with the key . Press the key . will appear. Press than use or to choose

between or and confirm with . After select the unit will appear and the instrument

returns to the function “F01”. Every time that the unit is changed, the parameters must be configurated again,

because they assume the standard values (item 4.2).

5. OPERATION

5.1 - Parameters visualization

a) Press at the same time the keys and for 2 seconds until appear , releasing them after that.

Soon, appears .

b) Use the keys and to access the desired function.

c) After select the function, press (short touch) to visualize the configured value.

d) Press again (short touch) to return the functions menu.

e) To reset the menu and return to normal operation (temperature indication), press until appear .

SET SET

SET

5.2 - Parameters alteration

a) Access the function F01 pressing at the same time and for 2 seconds until appear ,

releasing then after that. Soon will appear , and then press (short touch).

b) Use and to enter the access code (123), and then press .

c) Select the desired function and visualize the configured value, like explained the itens“5.1-b” and

“5.1-c”.

d) Use and to change the value and then press to record the configured value and return

to the functions menu.

e) To reset the menu and return to normal operation (temperature indication), press until appear

5.3 - Process stage, elapsed time and evaporator temperature (S2)

Press .The stage of the process will appear, the elapsed time (in minutes) and evaporator

temperature (S2).

In case of detached sensor or temperature out specified range will appear .

Process stages: Initial delay (delay to start the control)

Fan-delay (delay to fan return)

Refrigeration

Pre-defrost (only if F08 = 1)

Defrost

Draining

SET

FAN-DELAY REFRIGERATION DEFROST DRAINING

PRE-DEFROST

5.9 - Alarm inhibition

To inhibit the alarm output press the key . The messages will appear.

After the inhibition, the alarm output returns to be enabled when the instrument leaves the alarm status.

SET

B B

RS-485

B B

RS-485

SERIAL

Brown - A

Red - B

TC-940Ri plus

SERIAL

Brown - A

Red - B

TC-940Ri plus

5.8 - Registers of minimum and maximum temperatures

Press . Will appear and minimum and maximum temperatures of black sensor ( ambient). After

appear and minimum and maximum temperatures of gray sensor (evaporator).

Note: To reset the registers, keep pressed during visualization of minimum and maximum temperatures

until appear .

Power

supply

6. WIRING DIAGRAM

COMP

DEFR

FANS

COMUM

1245678910 11 12

45678910 11 12

ALRM

Digital input

GND

Sensor 2

gray cable (evaporator)

Sensor 1

black cable (ambient)

Loads

supply

Over the specifield current

use a contactor.

To the terminal of

the distribution box

7. INTEGRATING CONTROLLERS, RS-485 SERIAL INTERFACE AND

COMPUTER

Serial interface

RS-485

Full Gauge

External

mesh terminal

grounded

RS-485 Serial Interface

Device used to establish the

connection Full Gauge Controls’

instruments with the Sitrad .

Distribution Box

Used to connect more than one instrument to the Interface. The

wire's connections must be made in agreement with the following

rules: terminal A of the instrument connects to the terminal A of

the distribution box, that must be connected with the terminal A of

the Interface. Repeat the action for terminals B and , being

the cable shield.

the terminal of distribution box must be connected to the

respective terminals of each instrument.

Serial

communication

RS-485

Serial

communication

RS-485

PROTECTIVE :VINYL

This adhesive vinyl (included inside the packing) protects the instruments against

water drippings, as in commercial refrigerators, for example. Do the application after

finishing the electrical connections.

Remove the protective paper

and apply the vinyl on the entire

superior part of the device,

folding the flaps as indicated by

the arrows.

72 mm

Dimension of the clipping

for setting of the instrument

in panel

29 mm

12Vdc

5.10 - Inhibition of the alarm sound

To inhibit the audible alarm press the key for two seconds. After the inhibition, the audible alarm

returns to be enabled when the instrument leaves the alarm status.

Serial

communication

RS-485

- The sensor S1 (black) must be in the ambient.

- The sensor S2 (gray) must be placed in the evaporator through metallic cramp.

IMPORTANT

According to the chapters from the IEC60364 standard:

1: Install protectors against over voltage on power supply

2: Sensor cables and computer signals can be together, however not at the same place where power

supply and load wires pass for

3: Install suppresor of transient in parallel to loads to increase the usefull life of the relays.

Contact suppresor connection diagram

Suppresor

A1 e A2 are the

contactor coils.

Diagram for suppresor installation

for direct drive load inputs

Load

Suppresor

For direct activation the maximum

specified current should be taken

into consideration.

Note: The sensor cable lenght can be increased by the user until 200 meters using 2 x 24 AWG cable.

ENVIRONMENTAL INFORMATION

Package:

The packages material are 100% recyclable. Just dispose it through specialized

recyclers.

Products:

The electro components of Full Gauge controllers can be recycled or reused if it is

disassembled for specialized companies.

Disposal:

Do not burn or throw in domestic garbage the controllers which have reached the end-of-

life. Observe the respectively law in your region concerning the environmental

responsible manner of dispose its devices. In case of any doubts, contact Full Gauge

controls for assistance.

ALARM

3A / 240Vac

COMPRESSOR

12(8)A / 240Vac 1HP

DEFROST

5(3)A / 240Vac

FANS

5(3)A / 240Vac 1/8HP

Full Gauge Controls TC-940R Owner's manual

Brand: Full Gauge Controls

Model: TC-940R

Type: Owner's manual

This manual is also suitable for

TC-940R i Plus

Key features of the TC-940R i Plus include:

Precise temperature control: Set and maintain desired temperatures with high accuracy, ensuring optimal product preservation.
Defrost management: The controller automatically initiates and manages defrost cycles based on temperature or time, preventing frost buildup and maintaining evaporator efficiency.
Digital input: Utilize the digital input for external synchronization of defrost cycles or to activate nighttime setpoint mode, providing flexibility in operation.

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Full Gauge Controls TC-940R Owner's manual

This manual is also suitable for

Full Gauge Controls TC-940R Owner's manual

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